protected Layer createGhost() {
XElement div = Document.get().createDivElement().<XElement> cast();
Layer l = new Layer(div);
if (shim && GXT.isUseShims()) {
l.enableShim();
}
l.getElement().setClassName(getAppearance().ghostClass());
// neptune theme rounded corners applied to root element of window, not header itself
l.getElement().addClassName(getStyleName());
if (header != null) {